Question: Light from a sodium lamp ( = 589 nm) illuminates a narrow slit and is observed on a screen 75 cm behind the slit. The

Light from a sodium lamp (λ = 589 nm) illuminates a narrow slit and is observed on a screen 75 cm behind the slit. The distance between the first and third dark fringes is 7.5 mm. What is the width (in mm) of the slit?

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